`How to create class Triangle from class`a Point
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<div class="content__item-top-div"> <a class="content__item-top-name" href="#!">Demigodd</a><span class="content__item-top-p">2018-04-18 09:01:29</span></div>
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<div class="content__item-row dn"> <a href="#!"><b>Demigodd</b>,</a> 2018-04-18 09:01:29</div>
<p class="content__item-title large">How to create class Triangle from class`a Point?</p>
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Here is the point class, a point which consists of a coordinate..<br><pre><code class="cpp hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Point</span> {</span>
<span class="hljs-keyword">protected</span>:
<span class="hljs-keyword">float</span> x, y;
<span class="hljs-keyword">public</span>:
Point() {
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string">"Point constructor\n"</span>;
}
Point(<span class="hljs-keyword">float</span> x, <span class="hljs-keyword">float</span> y):x(x), y(y) {
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string">"Point constructor\n"</span>;
}
~Point() {
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string">"Point destructor\n"</span>;
}
<span class="hljs-function"><span class="hljs-keyword">float</span> <span class="hljs-title">getX</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">return</span> x;
}
<span class="hljs-function"><span class="hljs-keyword">float</span> <span class="hljs-title">getY</span><span class="hljs-params">()</span> </span>{
<span class="hljs-keyword">return</span> y;
}
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">setX</span><span class="hljs-params">(<span class="hljs-keyword">float</span> x)</span> </span>{
<span class="hljs-keyword">this</span>->x = x;
}
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">setY</span><span class="hljs-params">(<span class="hljs-keyword">float</span> y)</span> </span>{
<span class="hljs-keyword">this</span>->y = y;
}
};</code></pre><br>
I just can't imagine how it's possible to create a triangle through the class at all? For example, we take 3 points and then what?<br><pre><code class="cpp hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Triangle</span>:</span> <span class="hljs-keyword">public</span> Point {
<span class="hljs-keyword">protected</span>:
Point p1, p2, p3;
<span class="hljs-keyword">public</span>:
Triangle() {
}
~Triangle() {
}
<span class="hljs-function"><span class="hljs-keyword">double</span> <span class="hljs-title">getP</span><span class="hljs-params">()</span></span>{
<span class="hljs-keyword">return</span> p1 + p2 + p3;
}
};</code></pre>
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<div class="content__item-img large name-color-S"><span>S</span></div><span class="answer__name"><a href="#!">Stanislav Makarov</a>, 2018-04-18 <br/> @Demigodd</span>
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<p class="answer__detail">1. Why do you need inheritance in general? Are you saying that a triangle is a point?? <br>
2. Well, leave the three points that you have already declared as fields, and make methods for operations defined on triangles in general, for example, calculate the perimeter or area. Make a constructor that will accept these three points and additionally check that no two of them lie on the same line - you will get an invariant of a non-degenerate triangle. <br>
What books are you doing this for? Your teaching material is clearly not very good.</p>
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